Bill Burns <ftldny@...>
To add an email alias you have to click on the link on the account page "Advanced Settings For Email Aliases". This opens a dropdown section on the current page.
If you now add an alias, and that email address is already registered at groups.io, there should be an error message visible. However, when you enter such an address and click on "Add email Alias", the alias section closes without showing the message. Unless you again click on the "Advanced Settings..." link, you will never know that adding the alias failed.
The alias section should stay open and either confirm a successful add or show the error message.